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The head of a vector AB^-> is the endpoint B, i.e., the point at which the arrow is placed.

A fixed point for which the stability matrix has equal nonzero eigenvectors.

A spherical image of a curve. The most common indicatrix is Dupin's indicatrix.

A polynomial in which the sum of subscripts is the same in each term.

A linear recurrence equation is a recurrence equation on a sequence of numbers {x_n} expressing x_n as a first-degree polynomial in x_k with k<n. For example ...

The quantities obtained from cubic, hexagonal, etc., lattice sums, evaluated at s=1, are called Madelung constants. For cubic lattice sums ...

Mills (1947) proved the existence of a real constant A such that |_A^(3^n)_| (1) is prime for all integers n>=1, where |_x_| is the floor function. Mills (1947) did not, ...

The appropriate notion of integer for surreal numbers.

A fractal process for which H>1/2, so r>0.

A distribution with kurtosis excess gamma_2<0, and therefore having a flattened shape.